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Yes, Jason is right, but, additional to that, you should also suck in your abs, as though you're trying to squeeze your belly button through to your back bone. All of that, then, will seriously work your abs.

Yup. When I train my clients, one of the first things I tell them is to always tighten your stomach for every exercise, like if someone is about to punch you. While you do that, tighten your glutes at the same time and that should align your spine